Equal and unequal miniaturized power divider with Substrate Integrated waveguide and circular Complementary Split Ring Resonator has been proposed for C band applications. SIW structure reduces loss and improves the performance, whereas CSRR varies the resonant frequency and exhibits bandpass response. The power division ratio can be varied by changing the CSRR structure configuration. The power divider exhibits equal power division at 5.8 GHz and unequal at 5.9 GHz with power division ratio of 1:10 and 1:5. The dimension of the proposed power divider circuit is 10mm × 8.4 mm × 0.5 mm. © 2017 IEEE.